<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <!-- <meta name="viewport" content="width=device-width, initial-scale=1.0" /> -->
    <title>Document</title>
  </head>
  <body>
    <button id="btn">按钮</button>
    <script>
      let start
      btn.onclick = function () {
        const end = Date.now()
        console.log('click事件触发了', end - start)
      }
      btn.ontouchstart = function () {
        start = Date.now()
        console.log('touchstart事件触发了')
      }
    </script>
  </body>
</html>
